If you're going to nationals and are able to drive well enough to make use of the extra .1s it might gain you, then I would say there's a need. But I would rather have the extra tire life over the course of the season.
Dean will chime in though to tell you that shaved tires wear more evenly and therefore you get just about as much life out of them as un-shaved tires, but I still think the full depth tires last longer w/o giving up too much. Not to mention that they'll work in the wet.
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